Improvement in stamps for crushing ores



UNITED STATES PATENT OFFICE.

JAMES H. MOFARLAND, OF GOLDEN CITY, COLORADO TERRITORY.

IMPROVEMENT IN STAMPS FOR CRUSHING ORES.

Specification forming part of Letters Patent No. 140,425, dated July 1,1873 application filed May 31, 1873.

sists of'a novel mode of operating stamps for crushing and pulverizingores, &c., by a horizontal revolving cylinder, through which a series ofbars, with a stamp-head at each end,

are arranged diametrically, so that they can slide endwise a shortdistance. The cylinder is arranged a suitable distance above the bottomof the bed containing the ore, and caused to revolve slowly; the stamps,as they approach the vertical line, slide in the cylinder and strike ablow on the ore, and are then forced around by the cylinder, and have agrinding or crushing eflect. They strike two blows at each revolution.They are arranged as close together, both lengthwise andcircumferentially, as they can be and work well, and they strike a greatnumber of blows to each revolution.

Another part of my invention consists of a hollow cylindrical rotatingore-holder, into which the ore is fed at one end and caused to workalong slowly to the other end dur' ing the progress of the work, anddischarge through holes onto a screen, which is arranged to separate thefine particles and carry the coarse portion back to the head of theore-holder to be delivered into it again for reworking it. Another partof the invention consists of spiral ribs in the hollow revolvingore-holder, to work the ore along the cylinder as it is graduallyreduced by the stamps. v

Figure 1 is partly a side elevation and partly a sectional elevation ofmy improved orecrusher. Fig. 2 is a transverse section taken on the linea; w of Fig. 1, and Fig. 3 is a side elevation of one of the stamps.

Similar letters of reference indicate corresponding parts.

A is the outside cylinder or case for holding the ore. B is the insidestamp-carrying cylinder, and 0 represents the stamp. These stampsconsist of bars a with steel heads b, the bars and heads beingconsiderably longer than the diameter of cylinder B, and arranged thevertical line, so as to slide down on the walls of the holes in whichthey work. The end, sliding down and striking the ore, remains until itarrives near the top of the cylinder, when the bar slides again, and theother end falls on the ore, and so on. These stamps are arranged closetogether in the lengthwise direction of the cylinder, and,circumferentially, they are as close together as the shoulders 61 willallow, and, at the same time, let the stamp-heads fall to the bottom ofthe ore-holder. This cylinder B is turned by the shaft E. The outsidecylinder A is mounted on the journals F, and is turned by the wheel G;it receives the ore through the spouts H at one end, conveys it alongslowly to the other end, by the spiral ribs or corrugations I, at thesame time that it is subject to the stamps, and delivers the crushed oreat the other end through the holes J upon'a coarse screen, K, throughwhich the fine portions pass onto the screens L to be again separated,and the coarse portions are carried by said screens back to the head ofthe crusher to be passed through it again. The

screens are vibrated by the rod M and crank N; they are suspended by therods 0 from hooks P in the frame, to allow them to be shaken.

Having thus described myinvention, I claim .as new and desire to secureby Letters Patent- l. The mode of operating stamps by a revolvingcylinder, in which a series of stamps are arranged in radial mortises,substantially as specified.

2. The combination, with a series of stamps and an operating-cylinder,as described, of a revolving case inclosin g the stamps and hold- 4:.The combination, with the rotating case ing the ore to be crushed,substantially as and ore-holder, of the screens K L, arranged specified.substantially as specified.

3. The said revolving ore-holder, having spiral ribs or corrugations, incombination with the stamps for passing the ore along Witnesses: towardthe discharge as the crushing pro- L. J. SMITH, gresses, substantiallyas specified.

JAMES MAXEY MGFARLAND.

EDWARD D. 00E.

